Straight shank to 1/2". 1/2" reduced shank for sizes above 1/2". M2 high speed steel. Sharp cutting edge to drill in many different materials to include mild steel, cast iron, aluminum and wood. Extra length flute with continuous cutting edges for drilling deep holes and fast chip removal. Reduced shank fits all drill motors with 1/2" chucks. Non-slip grip prevents bit from spinning in the chuck.Tru-Cut